CN102263527B - Maximum power point tracking method for photovoltaic generation system - Google Patents
Maximum power point tracking method for photovoltaic generation system Download PDFInfo
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- CN102263527B CN102263527B CN201110220547.9A CN201110220547A CN102263527B CN 102263527 B CN102263527 B CN 102263527B CN 201110220547 A CN201110220547 A CN 201110220547A CN 102263527 B CN102263527 B CN 102263527B
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- maximum power
- point
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a maximum power point tracking method for a photovoltaic generation system. The method comprises the following steps: sampling an open-circuit voltage Voc of a photovoltaic cell, selecting an interval (m1Voc, m2Voc) containing the maximum power point and acquiring the number of iterations marked as n; acquiring a midpoint value of the voltage interval, acquiring the powers of P(k) and p(k+1) and judging the size of P(k) and p(k+1); if P(k)>P(k+1), changing the iteration interval, wherein the right endpoint of a new iteration interval is changed to be V(k+1) and the left endpoint remains unchanged; if P(k)<P(k+1), changing the left endpoint of the new iteration interval to be V(k) and keeping the right endpoint unchanged, then judging whether the number of iterations marked as n is reached or not; if not, tracking the maximum power according to the new iteration interval obtained in the step four; if so, obtaining the maximum power Pm. The method disclosed by the invention has high dynamic response speed and can be used for accurately tracking the maximum power point of a photovoltaic array, thereby reducing the energy loss of the system oscillating at the maximum power point and improving the output efficiency of the photovoltaic cell.
Description
Technical field
The present invention relates to a kind of maximum power point of photovoltaic power generation system tracking, belong to photovoltaic power generation technology field.
Background technology
The output voltage of photovoltaic cell and output current change along with the variation of the factors such as intensity of illumination, battery temperature and load, and the position of Maximum Power Output is unfixed.Under given conditions, photovoltaic cell output nonlinear and have unique maximum power point.
Conventional maximum power point tracing method has constant voltage process (CV), disturbance observation (P & O), increment conductance method (INC), fuzzy control etc., also has some improving one's methods based on practical problem.That constant voltage process is controlled is simple, be easy to realize, but bad adaptability, precision are low.Disturbance observation is controlled simple, convenient realization, in step-length hour, but precision is high, to shake little tracking velocity too slow; When step-length is larger, tracking velocity is fast, has but reduced precision, adds according to system concussion.It is better that increment conductance method is controlled effect, but control algolithm is complicated, to system accuracy, require high.Fuzzy control flexibly, comprehensive, compatibility is good, but causes system control precision to reduce and dynamic property decline.
Summary of the invention
To the object of the invention is in order addressing the above problem, to propose a kind of maximum power point of photovoltaic power generation system tracking, can follow the trail of fast the maximum power point of photovoltaic cell, and system is shaken the energy loss of bringing near maximum power point while reducing stable state.
A maximum power point of photovoltaic power generation system tracking, comprises the following steps:
Step 1: sampling photovoltaic battery open circuit voltage V
oc, the voltage V while exporting according to maximum power point
mwith open circuit voltage V
ocmeet V
m=mV
oc, choose the interval [m that comprises maximum power point
1v
oc, m
2v
oc] as between initial iterative region, wherein: V
ocfor open circuit voltage; V
mvoltage while exporting for maximum power point; M, m
1, m
2constant coefficients, span: 0≤m
1< m < m
2≤ 1.
Step 2: according to formula
calculate iterations n.Wherein: n is iterations; T is search precision, is more than or equal to the minimum precision that system allows.
Step 3: represent a=m when initial between iterative region with [a, b]
1v
oc, b=m
2v
oc.K is iterations, meets 0≤k≤n.According to formula
obtain the mid point between the k time iterative region, measuring distance mid point V
z(k) charging current of left and right sides ε electrical voltage point.Be V
l(k)=V
z(k)-ε and V
r(k)=V
z(k) the charging current I that+ε is ordered
l(k), I
r(k) value, according to formula P=V*I, calculates respectively this power P of 2
l(k), P
r(k).
Wherein: V
z(k) be the k time iteration voltage range midrange; ε is greater than zero real number; V
l(k) be mid point V between distance regions
z(k) magnitude of voltage of left side ε; V
r(k) be interval mid point V
z(k) magnitude of voltage of right side ε; I
l(k) be V
l(k) electrical voltage point is corresponding charging current value, I
r(k) be V
r(k) charging current value corresponding to electrical voltage point; P
l(k), P
r(k) be respectively electrical voltage point V
l(k), V
r(k) corresponding performance number.
Step 4: judgement P
land P (k)
r(k) size, if P
l(k) > P
r(k), change between iterative region, between new iterative region, a remains unchanged, by V
r(k) assignment, to b, becomes a=a, b=V
r(k); Otherwise, between new iterative region by V
l(k) assignment is to a, and b remains unchanged.Become a=V
l(k), b=b.
Step 5: judge whether k reaches iterations n, if do not have, returns to step 3, carries out new round iteration; If reach iterations n, choose mid point between final iterative region as maximum power electrical voltage point V
m, measure corresponding charging current I
m, according to formula P=V*I, calculate maximum power P
m.
The invention has the advantages that:
The method of the invention rapid dynamic response speed, the maximum power point of tracking photovoltaic array, has reduced the energy loss of system in maximum power point vibration exactly, has improved the delivery efficiency of photovoltaic cell.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention;
Fig. 2 is the schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The present invention is a kind of maximum power point of photovoltaic power generation system tracking, and flow process as shown in Figure 1, comprises the following steps:
Step 1: sampling photovoltaic battery open circuit voltage V
oc, the voltage V while exporting according to maximum power point
mwith open circuit voltage V
ocmeet V
m=mV
oc, choose the interval [m that comprises maximum power point
1v
oc, m
2v
oc] as between initial iterative region, wherein: V
ocfor open circuit voltage; V
mvoltage while exporting for maximum power point; M, m
1, m
2constant coefficients, span: 0≤m
1< m < m
2≤ 1.
Step 2: according to formula
calculate iterations n.Wherein: n is iterations; T is search precision, is more than or equal to the minimum precision that system allows.
Step 3: represent a=m when initial between iterative region with [a, b]
1v
oc, b=m
2v
oc.K is iterations, meets 0≤k≤n.According to formula
obtain the mid point between the k time iterative region, measuring distance mid point V
z(k) charging current of left and right sides ε electrical voltage point.Be V
l(k)=V
z(k)-ε and V
r(k)=V
z(k) the charging current I that+ε is ordered
l(k), I
r(k) value, according to formula P=V*I, calculates respectively this power P of 2
l(k), P
r(k).
Wherein: V
z(k) be the k time iteration voltage range midrange; ε is greater than zero real number; V
l(k) be mid point V between distance regions
z(k) magnitude of voltage of left side ε; V
r(k) be interval mid point V
z(k) magnitude of voltage of right side ε; I
l(k) be V
l(k) electrical voltage point is corresponding charging current value, I
r(k) be V
r(k) charging current value corresponding to electrical voltage point; P
l(k), P
r(k) be respectively electrical voltage point V
r(k), V
r(k) corresponding performance number.
Step 4: judgement P
land P (k)
r(k) size, if P
l(k) > P
r(k), change between iterative region, between new iterative region, a remains unchanged, by V
r(k) assignment, to b, becomes a=a, b=V
r(k); Otherwise, between new iterative region by V
l(k) assignment is to a, and b remains unchanged.Become a=V
l(k), b=b.
Step 5: judge whether k reaches iterations n, if do not have, returns to step 3, carries out new round iteration; If reach iterations n, choose mid point between final iterative region as maximum power electrical voltage point V
m, measure corresponding charging current I
m, according to formula P=V*I, calculate maximum power P
m.
Embodiment: the present invention chooses m
1be 0.6, m
2be 0.9,, maximum power point voltage is at interval [0.6V
oc, 0.9V
oc] in.As shown in Figure 2, interval midrange is
choose ε=0.01, near midrange, left side magnitude of voltage is 0.75V
oc-0.01, right side magnitude of voltage is 0.75V
oc+ 0.01.If V
ocget 21.75V, between interval [13.05V, 19.575V] original area as search.Choose error t=0.1, obtain iterations:
n＝7
Iterations is 1 o'clock, interval mid point V
z=16.3125V, so disturbance voltage V
1=16.3025V, V
2=16.3225V.Judgement P (V
1) and P (V
2) magnitude relationship, if P (V
1) > P (V
2), interval becomes
if P is (V
1) < P (V
2), interval becomes [16.3025V, 19.575V].Between Zai Yi new district, between iterative region, repeat above step, until iterations arrives 7, meet required precision.
The present invention follows the tracks of that number of times is few, speed is fast, steady-state behaviour system improves, and has improved the utilization ratio of photovoltaic cell.
Claims (1)
1. a maximum power point of photovoltaic power generation system tracking, is characterized in that, comprises the following steps:
Step 1: sampling photovoltaic battery open circuit voltage V
oc, the voltage V while exporting according to maximum power point
mwith open circuit voltage V
ocmeet V
m=mV
oc, choose the interval [m that comprises maximum power point
1v
oc, m
2v
oc] as between initial iterative region, wherein: V
ocfor open circuit voltage; V
mvoltage while exporting for maximum power point; M, m
1, m
2be respectively constant coefficients, span: 0≤m
1< m < m
2≤ 1;
Step 2: according to formula
calculate iterations n; Wherein: n is iterations; T is search precision, is more than or equal to the minimum precision that system allows;
Step 3: represent a=m when initial between iterative region with [a, b]
1v
oc, b=m
2v
oc; K is iterations, meets 0≤k≤n; According to formula
obtain the mid point between the k time iterative region, measuring distance mid point V
z(k) charging current of left and right sides ε electrical voltage point; Be V
l(k)=V
z(k)-ε and V
r(k)=V
z(k) the charging current I that+ε is ordered
l(k), I
r(k) value, according to formula P=V*I, calculates respectively this power P of 2
l(k), P
r(k);
Wherein: V
z(k) be the k time iteration voltage range midrange; ε is greater than zero real number; V
l(k) be mid point V between distance regions
z(k) magnitude of voltage of left side ε; V
r(k) be interval mid point V
z(k) magnitude of voltage of right side ε; I
l(k) be V
l(k) electrical voltage point is corresponding charging current value, I
r(k) be V
r(k) charging current value corresponding to electrical voltage point; P
l(k), P
r(k) be respectively electrical voltage point V
l(k), V
r(k) corresponding performance number;
Step 4: judgement P
land P (k)
r(k) size, if P
l(k) > P
r(k), change between iterative region, between new iterative region, a remains unchanged, by V
r(k) assignment, to b, becomes a=a, b=V
r(k); Otherwise, between new iterative region by V
l(k) assignment is to a, and b remains unchanged, and becomes a=V
l(k), b=b;
Step 5: judge whether k reaches iterations n, if do not have, returns to step 3, carries out new round iteration; If reach iterations n, choose mid point between final iterative region as maximum power electrical voltage point V
m, measure corresponding charging current I
m, according to formula P=V*I, calculate maximum power P
m.
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| CN102263527B true CN102263527B (en) | 2014-03-26 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778915B (en) * | 2011-12-26 | 2014-07-23 | 洛阳理工学院 | Self-adaptive MPPT (Maximum Power Point Tracking) method for solar energy with three stages of sectional temperature fed back based on final power |
| CN103365333B (en) * | 2012-03-31 | 2014-12-03 | 阳光电源股份有限公司 | MPPT (maximum power point tracking) scanning method for photovoltaic arrays |
| CN103455080A (en) * | 2012-12-27 | 2013-12-18 | 深圳信息职业技术学院 | Method and device for photovoltaic cell power tracking |
| CN103105884B (en) * | 2013-01-22 | 2014-06-25 | 重庆大学 | Photovoltaic power generation system maximum power point tracing system and method |
| CN105159389B (en) * | 2015-09-14 | 2016-09-21 | 潍坊学院 | A kind of maximum power point of photovoltaic array tracking successively decreased based on interval |
| CN105334901B (en) * | 2015-11-20 | 2016-10-05 | 国网甘肃省电力公司电力科学研究院 | A kind of maximum power point of photovoltaic power generation system intelligent-tracking method |
| CN105913161B (en) * | 2016-05-18 | 2019-06-28 | 安徽大学 | A kind of acquisition methods of the photovoltaic system maximum power point based on multiple-objection optimization |
| CN106527570B (en) * | 2016-12-20 | 2018-06-15 | 湘潭大学 | A kind of photovoltaic array multimodal maximum power group hunting optimizes tracking |
| CN106846436B (en) * | 2017-02-21 | 2020-09-04 | 中国计量大学 | Method for dividing multi-peak P-U curve of series photovoltaic module into regions |
| CN117075680B (en) * | 2023-08-31 | 2024-08-06 | 吉林建筑大学 | Maximum power point tracking method and system for photovoltaic power generation, electronic equipment and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101534074A (en) * | 2009-04-10 | 2009-09-16 | 保定天威集团有限公司 | Maximum power tracking control method |
| CN101719737A (en) * | 2009-10-27 | 2010-06-02 | 艾默生网络能源有限公司 | Scanning method for tracing maximal power point of solar energy photovoltaic panel |
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|---|---|---|---|---|
| CN101534074A (en) * | 2009-04-10 | 2009-09-16 | 保定天威集团有限公司 | Maximum power tracking control method |
| CN101719737A (en) * | 2009-10-27 | 2010-06-02 | 艾默生网络能源有限公司 | Scanning method for tracing maximal power point of solar energy photovoltaic panel |
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